Why does setting up a new eprint address procedure reach a dead end?

Question

UPDATE 2012 03 08 Thursday
About 30 minutes after posting this message, I starting trying again. I was having the same problems. Eventually, I started to get suggestions for names - a list of about 6 - after clicking CHECK. But, then when I would try those names - they didn't work. Then I tried the name I had originally wanted - and bingo! The dialog box returned a message saying the name was available. There was also a SAVE button in the dialog window. I saved it, the dialog window closed, and the intial page refreshed automatically showing the new address.
Yay! But, should I have had to go through all of that? And then, logging back into these forums! There were renewed difficulties. I had to - once again - change my password. Which I had to do to post my original message below.
Anyhow, I still think this process needs to be addressed. It shouldn't be so troublesome.
ORIGINAL POST
I am trying to personalize the eprint email address for my HP Officejet 7500A Wide format printer.
( Although, I think the model has nothing to do with the problem in general. )
I had little trouble signing in to the eprint centre and forums. Yay!
( I had some trouble, but that's another story.)
Step 1. I found the page for setting up a new address. My initially issued address is displayed correctly. (hidden here by me) And I clicked the 'Change' button. (under arrow)
Step 2. I saw my initial address correctly in the dialog box and window that popped. (above arrow)
(There are some browser display problems with that dialog window, but, again, that's another problem.)
Step 3. I enter a 'new' address conforming to the naming rules. And, click 'Check' button.
Step 4. A useless 'dialog' window appears. There's no message - no 'save' - no 'accept' - no 'change' button...the only option is to click the X and close the window.
(Yes, I tried various names. Yes, I tried waiting various times. No, I'm not an idiot.)
Step 5.I saw my original address is unchanged.
I tried the 'Refresh' button.
My browser window refreshes.
The address is the same.
Step 6. I clicked 'Refresh' again. I checked my email for confirmation of the change or a request to authorize a change or something that would make sense.
( I started to think bad things.)
Step 7. I searched the various forums, with various keywords without any luck. So, here we are. A new post.
Any constructive help in solving this problem will be appreciated. I have very high to superior computer and networking skills, so uninformed gibberish about 'firewall' 'browser' 'personal hygiene' or similar, will be ignored. TY

Answer 1

Hi HW,
The PBX is a Panasonic TA308. There is no special interface to the PBX,  the  line port on the SPA3102 is simply plugged into an extension, like another phone. Anyone calling that extension will have the call routed through the SPA & PAP2 to the remote phone.
The whole setup is totally seamless, & transparent to the user. As we are on a local network there is virtually no latency. There is a slight tendancy to echo,  but the echo suppression mostly takes care of that.
THis has been a good exercise, and once I got my head around what I was trying to do, with your help,  it was pretty easy.  I think the hook flash timing would be the thing which gives most users a problem, as it seems to vary widely around the world. I was surprised at the difference between the US and NZ (.1 & .9 to .07 & .13).  There didn't seem to be any other critical differences.
Now I am the local expert on VoIP   "In the Kingdom of the blind, the one-eyed man is King."